P0025 on 2020-2021 Lincoln Aviator: Causes and Fixes for Over-Retarded Cam Timing

What's Unique About the 2020-2021 Lincoln AVIATOR

The 3.0L Twin-Turbo V6 in the Aviator uses a sophisticated Variable Camshaft Timing (VCT) system that is highly dependent on oil pressure and cleanliness. Ford/Lincoln has issued Technical Service Bulletins (TSBs) acknowledging that this and related timing codes can be caused by small debris in the oil, which causes the VCT solenoids to stick. This makes regular oil changes with the correct, specified oil type especially critical for preventing this common issue. The 2020 launch year of the Aviator was also noted by some owners to have various quality control issues, making early diagnosis of engine faults important.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this vehicle. 👇

Symptoms You May Notice

• Check Engine Light is on
• Rough or unstable engine idle
• Reduced engine power and poor acceleration
• Engine may be hard to start
• Decreased fuel economy
• Engine stalling, especially when coming to a stop
• Engine knocking or ticking noises, particularly on startup.

Most Likely Causes

1. Low, Dirty, or Incorrect Viscosity Engine Oil 🔴 High Probability The VCT system is hydraulic and extremely sensitive to oil pressure and cleanliness. TSBs confirm that debris in the oil is a known cause of VCT solenoid issues on this platform. The twin-turbo engine can degrade oil more quickly, making on-time oil changes vital.
   How to confirm: Check the oil dipstick for level and inspect the oil's color and consistency. If it's low, dark, or sludgy, it needs to be changed. This is the first and most important diagnostic step.
   Typical fix: Perform an engine oil and filter change using the manufacturer-specified full synthetic oil (e.g., Motorcraft SAE 5W-30) and a quality filter (e.g., Motorcraft).
   Est. part cost: $50-$100
2. Failing Bank 2 Exhaust VCT Solenoid 🔴 High Probability → Shop Engine Variable Valve Timing (VVT) Solenoid This is the most common mechanical failure for this code, as noted in manufacturer TSB SSM 50067, which states the solenoid can stick due to small debris. It is a widely documented failure point across many Ford/Lincoln V6 engines.
   How to confirm: After verifying oil is good, a mechanic can use a scan tool to command the solenoid on and off 🎬 Watch: How to test if your VVT solenoid is working, or run the specific VCT self-test. A common DIY method is to swap the Bank 2 exhaust solenoid with the Bank 1 exhaust solenoid. If the code changes to P0015 (Bank 1 equivalent), the solenoid is confirmed bad.
   Typical fix: Replace the Bank 2 (driver's side) exhaust VCT solenoid. It is recommended to replace the valve cover gasket at the same time as it must be removed for access. 🎬 Watch this walkthrough on replacing VVT solenoids on a Ford V6
   Est. part cost: $40-$100
3. Failing Camshaft Phaser ⚪ Low Probability → Shop Engine Camshaft While less common than a solenoid failure, the mechanical phaser at the end of the camshaft can fail internally, get stuck, or leak oil pressure, preventing it from adjusting timing correctly. The 3.0L EcoBoost family has known issues with cam phaser rattle on cold starts.
   How to confirm: This is a more advanced diagnosis. It often presents with a distinct rattling noise from the engine on cold startups. If a new solenoid and clean oil do not fix the code, the phaser is the next suspect. Requires timing cover removal to inspect.
   Typical fix: Replace the Bank 2 exhaust camshaft phaser. This is a labor-intensive job that also requires replacing the timing chain, guides, and tensioners.
   Est. part cost: $150-$400

Rare But Worth Checking

• Stretched Timing Chain or Failed Guide/Tensioner: → Shop Engine Timing Chain If the timing chain has stretched or a guide/tensioner has failed, the base timing will be incorrect, which can trigger this code. This is usually accompanied by rattling noises from the front of the engine. A Ford Edge owner with a similar 2.7L EcoBoost V6 reported that after replacing VCT solenoids did not fix P0025, a stretched timing chain was found to be the root cause.
• Faulty Camshaft Position Sensor: → Shop Engine Camshaft Position Sensor It's possible for the sensor itself to fail and send incorrect data, but it's much more likely that the sensor is accurately reporting a mechanical or hydraulic problem. Do not replace the sensor unless it has been specifically tested and proven faulty.
• Clogged Oil Passages: In cases of severe engine sludge or debris from a previous component failure, the small oil passages leading to the VCT solenoid and phaser can become blocked, starving them of the oil pressure needed to operate. This is why TSB SSM 50067 suggests trying to clear debris before replacing parts.

Diagnosis Steps

1. Verify the code with a reliable OBD-II scanner.
2. Check the engine oil level and condition. If low, top it off. If old or dirty, perform a complete oil and filter change with the correct viscosity oil (e.g., Motorcraft SAE 5W-30).
3. Clear the code and test drive the vehicle to see if the code returns. If it does not, the issue was likely the oil.
4. If the code returns, use a scan tool with live data capability to monitor the commanded vs. actual camshaft position for the Bank 2 exhaust cam.
5. Per TSB SSM 50067, use a capable scan tool to access the Powertrain Control and Emissions Diagnosis (PC/ED) menu and run pinpoint test HK12. This will cycle the affected VCT solenoid 10 times to attempt to clear any internal debris. If the code clears and does not return after this test, the issue is resolved.
6. If the code persists, swap the Bank 2 exhaust VCT solenoid with the Bank 1 exhaust solenoid. Clear the codes and drive the vehicle. If the code returns as P0015, the solenoid you moved is faulty and needs to be replaced.
7. If the code remains P0025 after the swap, inspect the wiring and connector for the Bank 2 exhaust VCT solenoid for damage or corrosion.
8. If wiring is intact, the issue is likely more complex, such as a failing camshaft phaser or a timing chain problem, and may require professional diagnosis.

Parts You'll Likely Need

• Engine Variable Camshaft Timing (VCT) Solenoid (OEM #FT4Z-6M280-B (supersedes FT4Z-6M280-A)) — This is the most common point of failure for code P0025, often getting stuck due to oil debris, as confirmed by manufacturer TSBs.
  Trusted brands: Motorcraft, Standard Motor Products (VVT346), Dorman (916-517), NGK (VV0146), Holstein (2VTS0238)
  OEM price range: $70-$120
  Aftermarket price range: $30-$80
• Engine Oil and Filter — The VCT system is hydraulic. Low, dirty, or incorrect viscosity oil is a primary cause of this code.
  Trusted brands: Motorcraft
  OEM price range: $50-$100
  Aftermarket price range: $40-$80
• Valve Cover Gasket Set — Accessing the VCT solenoids on the 3.0L V6 requires removing the valve covers. The gaskets are single-use and must be replaced to prevent oil leaks.
  Trusted brands: Motorcraft, Fel-Pro
  OEM price range: $60-$100
  Aftermarket price range: $40-$70

Related Codes That Often Appear With This One

• P0015 — This is the same 'over-retarded' code for Bank 1. If both appear together, it strongly suggests a systemic issue like very low oil level/pressure affecting the entire engine.
• P0024 — This is for an 'over-advanced' condition on the same camshaft (Bank 2 Exhaust). Seeing both codes could indicate a very erratic VCT solenoid that is sticking intermittently in both directions or a phaser that is failing.
• P0019 — This code for 'Crankshaft Position - Camshaft Position Correlation Bank 2 Sensor B' often appears with P0025. If the cam timing is retarded, its correlation with the crankshaft will also be incorrect, triggering P0019.
🎬 See how to diagnose and fix a P0019 correlation code

Technical Service Bulletins (TSBs) & Recalls

• SSM 54366: Notes updated diagnostic pinpoint tests for a range of VCT codes including P0025.
• SSM 50067: Suggests P0025 may be caused by small debris causing the VCT solenoid to stick and advises a specific diagnostic cycling test to clear debris before component replacement.

Platform-Specific Known Issues

• According to Lincoln TSB SSM 50067, this code may be set due to small debris causing the VCT solenoid to stick. It specifically advises running a diagnostic test (Pinpoint Test HK12) to cycle the solenoid 10 times to attempt to clear the debris before attempting component replacement.
• TSB SSM 54366 notes that the official diagnostic procedures (Pinpoint Test HK) for this and related VCT codes have been updated in the workshop manual, indicating this is a recognized and common issue requiring revised diagnostics.
• The 2020 model year, being the first year of the new generation, was subject to numerous owner complaints about general quality control and reliability, although not all were engine-related.

Mechanic-Grade Diagnostic Values

• VCT Solenoid Internal Resistance — expected: Approximately 5-15 Ohms. Failure: A reading of infinite resistance (open circuit) or zero resistance (short circuit) indicates a failed solenoid coil.
• Engine Oil Pressure at Hot Idle — expected: Minimum of 15 PSI. Failure: Pressure below 15 PSI at normal operating temperature can cause the VCT system to malfunction.

Scan Tool Commands That Help

• Ford IDS (Integrated Diagnostic System) or equivalent professional scanner: Pinpoint Test HK12: VCT Solenoid Cycle Test — This is the manufacturer-recommended first step after verifying the code. It cycles the solenoid 10 times to dislodge small debris that may be causing it to stick, potentially fixing the issue without part replacement.
• Ford IDS or equivalent professional scanner: VCT Solenoid Actuator Test / Bidirectional Control — Use this test at idle to command the solenoid on and off. A working solenoid will cause the engine to hesitate, run rough, or stall when activated, confirming the solenoid is mechanically moving and oil passages are not fully blocked.

Real Owner Repair Stories

• Ford Edge Forum user (2016 Ford Edge Sport 2.7L EcoBoost (similar V6 architecture)) — Check engine light with codes P0019 and P0025.
  ❌ Tried (didn't work) Replaced all four VCT solenoids, Performed multiple oil changes
  ✅ What actually fixed it The timing chain had stretched. After a technician replaced the timing chain, tensioners, and guides, the codes were resolved.
• fordtransitusaforum.com user (2020 Ford Transit 3.5L EcoBoost (similar V6 architecture)) — Check Engine Light with code P0025.
  ❌ Tried (didn't work) Oil and filter change
  ✅ What actually fixed it The owner took the vehicle to a dealer who diagnosed and replaced the Bank 2 (driver's side) exhaust VCT solenoid. This fixed the issue.

When the Usual Fixes Don't Work

• While the most common fixes are an oil change or a new VCT solenoid, there are documented cases on similar Ford EcoBoost V6 engines where these repairs did not solve the problem. In one instance involving a 2.7L EcoBoost, the ultimate cause of P0025 (along with P0019) was a stretched timing chain, which required a much more extensive and costly repair. This highlights that if the simple fixes don't work, a deeper mechanical issue like base timing should be investigated, especially if rattling noises are present.

OEM Part Supersession History

• FT4Z-6M280-A → FT4Z-6M280-B — This is a common supersession for Ford parts, typically indicating a minor revision for improved durability, a change in supplier, or a correction of a known issue. The -B revision is the current recommended replacement part.
  Heads up: The parts are interchangeable. FT4Z-6M280-B should be used for all repairs.

Model Year Variations Within This Range

• 2020-2021: There are no significant mechanical or electrical differences reported between the 2020 and 2021 Lincoln Aviator models with the 3.0L V6 that would affect the diagnosis or repair of code P0025.